/*! ========================================================================
** Extended Template and Library
** Mutex Abstraction Class Implementation
**
** Copyright (c) 2002 Robert B. Quattlebaum Jr.
**
** This package is free software; you can redistribute it and/or
** modify it under the terms of the GNU General Public License as
** published by the Free Software Foundation; either version 2 of
** the License, or (at your option) any later version.
**
** This package is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
** General Public License for more details.
**
** === N O T E S ===========================================================
**
** This is an internal header file, included by other ETL headers.
** You should not attempt to use it directly.
**
** ========================================================================= */

#ifndef __ETL__MUTEX_WIN32_H_
#define __ETL__MUTEX_WIN32_H_

#include <windows.h>
// extern HANDLE CreateMutex(NULL, FALSE, NULL);
// extern WaitForSingleObject(handle, INFINITE);

_ETL_BEGIN_NAMESPACE

class mutex
{
    HANDLE handle;
public:

    mutex()
    {
        handle = CreateMutex(NULL, FALSE, NULL);
    }

    ~mutex()
    {
        CloseHandle(handle);
    }

    // Exception-safe mutex lock class
    class lock
    {
        mutex *_mtx;
    public:
        lock(mutex &x): _mtx(&x)
        {
            _mtx->lock_mutex();
        }
        ~lock()
        {
            _mtx->unlock_mutex();
        }
        mutex &get()
        {
            return *_mtx;
        }
    };

    void lock_mutex(void)
    {
        WaitForSingleObject(handle, INFINITE);
    }

    bool try_lock_mutex(void)
    {
        return WaitForSingleObject(handle, INFINITE) == WAIT_FAILED;
    }

    void unlock_mutex(void)
    {
        ReleaseMutex(handle);
    }
};

_ETL_END_NAMESPACE

#endif